the nfl says it did not intentionally hide the dangers of concussions from players. and is doing everything it can now to protect them. >> so many parents watching this story closely. much more will appear on espn's "outside the lines" and "world news." george? >> guys, thanks. >>> we're going to turn to that race against time to save a family of orcas trapped under arctic ice. this video shows the whales desperately trying to get the air they need to survive. rob nelson has more on the international fight to free these giants. >> reporter: in this amateur video, you can see the killer whales fighting to break through a thick blanket of arctic ice. as people from a nearby town watch helplessly. at least 12 of the giant animals, believed to be an entire family, swam into the waters north of quebec, during recent warm weather. but with temperatures now dropping, the animals are trapped below a hole no bigger than a truck, struggling for air. and the coast guard says that hole is rapidly closing around them. >> i don't know how far it is to the next air hole. but i imag